Dave, tried last weekend again and was not to successful.
Lowered the idle setting and this prevents to much pressure built up and stops the leaking, as suggested by Mark B. Fuess in link.
It still leaks when engine is stopped after running at a higher rpm.

It seems to run wel for a second or ten. As with the previous attempts it starts to run bad after that amount of time.
It is throwing props, destroyed the alu spinner and the prop. It is detonating in transition, but also emits lots of smoke during transition as if it is running rich. Turned the regulator more out then flush with the housing to richen up the midrange but stil is detonating.

For the time being i'm giving up with this engine (brand)
Thanks for your help, time and patience.